Yamaha/Mariner 4–5 HP Impeller (Parsun) – 6-Blade Pump Impeller

This Yamaha/Mariner 4–5 HP impeller is the perfect replacement for a worn pump rotor in small outboard engines. It’s suitable for both 2-stroke and 4-stroke Yamaha and Mariner engines in the 4–5 HP range (including models sold under brands like Parsun, Selva, etc., which use similar components). With a 6-blade geometry and flexible neoprene construction, the impeller provides a steady supply of cooling water even at low RPM, protecting the engine from overheating during extended operation.

The OEM-grade quality of this product means it meets all original specifications – it directly replaces the factory impeller (for example, Mercury #47-96305M and Yamaha #6E0-44352-00). This ensures a trouble-free fit and performance identical to the original part. Installation is quick: simply remove the water pump cover, take out the old impeller, and insert the new one. The whole operation can be done in a short time, which is especially crucial when you’re on the water and need to restore cooling urgently.

Small 4–5 HP engines are commonly used to power lightweight boats – such as bait boats, compact fishing dinghies, small yacht tenders, or as auxiliary motors on sailboats. In these applications, the engine often runs at low speed or idle for long periods, which can cause heat buildup if the impeller isn’t working optimally. A new impeller ensures that even during extended trolling or harbor maneuvers, the flow of cooling water remains sufficient. Keeping a spare impeller on board for this class of engines is highly recommended – it takes up minimal space but can prove invaluable in an emergency.

• Broad Compatibility: Works not only with Yamaha/Mariner but also with other international brands (Parsun, Hidea, Selva) that utilize similar 4–5 HP engine designs.
• Cool Running at Idle: Keeps the engine properly cooled during prolonged trolling or training sessions at slow speeds.
• Small Cost, Big Benefit: Timely impeller replacement prevents costly damage – a small investment that protects your engine.
• Easy Maintenance: Even hobbyists can replace the impeller themselves by following the engine’s manual – the process is simple and quick.
• Lasting Efficiency: Thanks to neoprene construction, the impeller retains its flexibility and pumping efficiency longer, ensuring consistent cooling power.